<!DOCTYPE html>
<html>

<head>
    <meta charset="utf-8">
    <title>CSS3 中的 box-shadow 属性被用来添加阴影:</title>
    <style>
        div {
            width: 300px;
            height: 100px;
            background-color: yellow;
            box-shadow: 10px 10px 5px #888888;
        }
    </style>
</head>

<body>

    <div></div>

</body>

</html>